N,N,N',N,-tetramethylethylenediamine; zinc; titanium tetrachloride in tetrahydrofuran; dichloromethane Title compound not separated from byproducts.;

1: pyridine / tetrahydrofuran / -50 °C / |Inert atmosphere 2: t-butyldimethylsiyl triflate / dichloromethane / 0.5 h / -78 °C / |Inert atmosphere View Scheme

sodium hydrogen sulphate; silica gel in dichloromethane T=20°C; 1.5 h;